Elections to Ballymena Borough Council were held on 18 May 1977 on the same day as the other Northern Irish local government elections.

The election used four district electoral areas to elect a total of 21 councillors.

Note: "Votes" are the first preference votes.

1973: 2 x UUP, 1 x DUP, 1 x Independent 1977: 2 x DUP, 1 x UUP, 1 x Independent 1973-1977 Change: DUP gain from UUP 1973: 2 x DUP, 2 x Independent Unionist, 1 x UUP, 1 x Independent 1977: 4 x DUP, 2 x UUP 1973-1977 Change: DUP (two seats) gain from UUP and Independent, Independent Unionists (two seats) join UUP 1973: 3 x UUP, 1 x DUP, 1 x Vanguard 1977: 3 x DUP, 2 x Independent Unionist 1973-1977 Change: DUP gain from UUP, Independent Unionists (two seats) leave UUP and Vanguard 1973: 3 x UUP, 1 x DUP, 1 x Alliance, 1 x Independent 1977: 2 x DUP, 1 x UUP, 1 x Alliance, 1 x Independent, 1 x Independent Unionist 1973-1977 Change: DUP gain from UUP, Independent Unionist leaves UUP